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Python Attribute Examples
Consider the case where you have a Gurobi model 
. You can
retrieve the number of variables in the model by querying the
NumVars model attribute:
print(m.numVars)(Note that attribute capitalization doesn't matter in the Python interface, so you could also query
or 
).
If you've performed optimization on the model, the optimal objective value can be obtained by querying the ObjVal model attribute:
print(m.objVal)
If you'd like to query the value that a variable takes in the computed solution, you can query the X attribute for the corresponding variable object:
for v in m.getVars():
print(v.x)
You can also query the value of 
for multiple variables in a single
getAttr call
on the model :
print(m.getAttr(GRB.Attr.X, m.getVars()))
For each attribute query method, there's an analogous 
routine.
To set the upper bound of a variable, for example:
v = m.getVars()[0] v.ub = 0(In this example, we've set the upper bound for the first variable in the model to 0).
